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Sailboat Specifications

Fifty 21

Masthead Sloop · Fin With Rudder On Skeg

Designed by Joubert · Built by Kirié (Fra) · First built 1977

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LOA 20.51 ft  ·  Beam 8.04 ft  ·  Displacement 3,968.00 lb  ·  Sail Area 263.00 ft²  ·  Masthead Sloop  ·  Fin With Rudder On Skeg
About the Fifty 21 Sailboat

Built by French manufacturer Kirié from 1977 to 1980, this compact cruiser represents a thoughtful approach to small boat design during the late 1970s. Designer Joubert created a vessel that balances reasonable performance with practical cruising capabilities, evident in its moderate displacement of 3,968 pounds and well-proportioned sail plan of 263 square feet. The Fifty 21's fin keel with rudder on skeg configuration provides good directional stability while maintaining adequate maneuverability in tight quarters. With a beam of just over eight feet and draft under three feet, this boat can access shallow anchorages while still offering reasonable interior volume for weekend cruising. The comfort ratio of 21.22 suggests a relatively stiff, quick motion that experienced sailors will appreciate, though it may feel lively to those accustomed to heavier displacement vessels. Limited to just 150 hulls during its brief production run, the Fifty 21 suits coastal cruising and day sailing particularly well. Its fiberglass construction ensures durability, while the masthead sloop rig keeps sail handling straightforward. The SA/Displacement ratio of 16.84 indicates respectable performance potential, making this an appealing choice for sailors seeking a nimble, manageable cruiser with distinctive French design character.

Dimensions & Specifications
LOA (Length Overall) 20.51 ft / 6.25 m
LWL (Waterline Length) 16.90 ft / 5.15 m
Beam 8.04 ft / 2.45 m
Max Draft 2.79 ft / 0.85 m
Displacement 3,968.00 lb / 1,800 kg
Ballast 992.00 lb / 450 kg
Sail Area (Reported) 263.00 ft² / 24.43 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Joubert
Builder Kirié (FRA)
First Built 1977
Last Built 1980
Number Built 150
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Frequently Asked Questions

What is the Fifty 21's sail area to displacement ratio?

The Fifty 21 has a Sail Area to Displacement ratio (SA/D) of 16.84. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Fifty 21's comfort ratio?

The Fifty 21 has a Ted Brewer Comfort Ratio of 21.22. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Fifty 21 safe for offshore sailing?

The Fifty 21 has a Capsize Screening Formula value of 2.03. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Fifty 21?

The theoretical hull speed of the Fifty 21 is 5.51 kn knots, calculated from its waterline length.

How much does a Fifty 21 weigh?

The Fifty 21 has a displacement of 3,968.00 lb and a length overall (LOA) of 20.51 ft.

Who designed the Fifty 21?

The Fifty 21 was designed by Joubert, first built in 1977.